The HTTP method used for the HTTP keepalive type. The
methods operate in the following manner:
HEAD -- HTTP HEAD generated. 200 response code required
GET -- HTTP GET generated. MD5 Hash of entify body performed.
First successful GET (200 response code) becomes reference
hash. Deviation from rererence hash result, or non-200
response code, results in service state transition.
POST -- Same as GET with substituation of POST method.